Improvement in automatic telegraph receivers and transmitters



' (a. LITTLE.

Paterited July 23 1872.

' Improvement in AutomatioTelegraph Receivers and Transmitters.

PATENT OFFICE.

, GEORGE LITTLE, OF RUTHERFORD PARK, NEW JERsEY.

IMPROVEMENT IN AUTOMATIC TELEGRAPH RECEIVERS AN D TRANSMITTERS.

Specification forming part of LettersPatent No; 129,840, dated July 23, 1872.

To all whom it may concern:

Be it known that I, GEORGE LITTLE, of Rutherford Park, in the county of Bergen and State of New J ersey, have invented an Im provement in Automatic Telegraphic Transmitting and Receiving Instruments; and the following is declared to be a correct description thereof.

The object of this invention is to lift the stylus, the friction-brush, and the roller from the drum simultaneously for inserting or withdrawing the paper. This is accomplished by mounting these parts in a swinging frame that is hinged to a standard. The drum also is made in two parts, insulated, so that currents of different polarity can be sent from the two lines of perforations in the paper with much less risk of the currents crossing or becoming neutralized than in themachines before constructed. I also arrange the L batteries and connections so that their action is rendered more uniform. Telegraph transmitting-machines, such as the Siemens and the Wheatstone,-have been used in which two lines of perforations have been employed, and at the receiving-station the recording device has been brought into action by means of the perforations in one line and the action arrested by the other line of perforations. My present improvements may be employed with receiv ing instruments of theaforesaid character or wherever available in telegraphin g.

In the drawing, Figure 1 isa vertical section of the parts longitudinally of the shaft of the drum or roller and the electric connec tions. Fig. 2 is an elevation of the roller, drum, and transmitting mechanism; and Fig. 3 is a detached view of the circuit-closing roller.

The drum or roller a ismade of two halves, insulated at b from each other and from the shaft c,.and upon the hubs d, or other convenient part of the roller, the springs e e bear, so

as to maintain a metallic contact. These springs 6 may be connected to separate linewires or binding-screws, or pass to the earthconnections, according to the circumstances under which the instrument is to be used. The connections hereafter described are preferable. The rollers i i are upon separate swinging arms 6 kept toward the drum a by springs 4, and each arm is fastened to a plate,

i upon the frame m, so as to be insulated, and from these the conductor or other metallic connections pass to the line. These rollers M are insulated in order that the separate or reverse currents from one or more batteries or condensers may pass from one roller or stylus or the other in transmitting by paper perforated in two lines. The roller h that presses the strip of paper to the drum a, the rollers i'ior stylus, and the friction-brush Z are all mounted upon the frame 'm-that is, hinged, so that the parts can be lifted or turned back from the roller or drum a in inserting or withdrawing the paper. Iiremark that one hinge, .9, might be employed'alone, or a second hinge, 1", maybe also used, so as to allow the frame and parts to be turned back with facility, and the hinge-pin may be either parallel to or at right angles with the axis of the drum a. The frame carrying the roller h, stylus, pen, or marker, and brush l may be applied in either transmitting or receiving instruments, and a spring of any convenient character is used to draw the frame and parts toward the roller or drum a with the necessary force. The shaft 0 may be in two parts and the connections made at the end bearings of such shaft, the portions of the shaft being either separated from each other or united by non-conducting material. The batteries t and. a are connected with opposite poles to the earth-connection o, and rheostats w w are introduced to adjust the force of the currents. The circuits are connected to the galvanometer z, and by closing the switch at w and adjusting the rheostats until the galvanometer is not influenced the two batteries will be rendered equal in their action upon the line; and hence) the line will be kept much more free from accumulation of electricity, and hence more rapid in action.

I claim as my invention-- 1. The roller or drum a, made of two parts, insulated from each other, in combination with separate metallic connections from the respective parts of said drum, substantially as arid-flier the purposes set forth.

2."A hinged frame carrying the pressureroller, the friction-brush, and the stylus, roll and. roller a, as set forth, for transmitting by the use of paper perforated in two lines, as set forth. o

Signed by me this 22d day of May, A. D.

GEORGE LITTLE. Witnesses:

GEO. T. PINOKNEY, CHAS. H. SMITH. 

